1st Stage 1st Stage Technology Diaphragm, Balanced Mechanism T-Shape Maximal Working Pressure 232 bar in Yoke Version300 bar in DIN Version ACD System Yes Number of HP Ports 2 (7/16" UNF) Number of MP Ports 4 (3/8" UNF) Medium Pressure 9.5 bar (145 psi) Flow Rate (Surface, Hose) 1,450 l/minHP = 200 bar (2900 psi) Body Marine Brass, Bright Chrome Plating Spring Stainless Steel Conical Filter Sintered Bronze O-Rings EPDM 2nd Stage 2ndstage 2nd Stage Technology Balanced Mechanism Demand Valve, Downstream Poppet Cracking Effort 2.8 to 3.8 mbar (0.04 to 0.05 psi) Cracking Effort Knob Yes Box Bottom, Deflector ABS Purge Cover Polyurethane Mouthpiece, Exhaust Valve, Diaphragm Silicone Poppet Polyurethane Adjustable Crown Marine Brass, Bright Chrome Plating